Model Comparison

GPT-5.4 vs Muse SparkWhich is better in 2026?

GPT-5.4 significantly outperforms across most benchmarks.

Verdict: GPT-5.4 vs Muse Spark — which is better?

GPT-5.4 (by OpenAI) and Muse Spark (by Meta) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

GPT-5.4 outperforms in 7 benchmarks (ARC-AGI v2, GDPval-AA, GPQA, MMMU-Pro, SWE-Bench Pro, Tau2 Telecom, Terminal-Bench 2.0), while Muse Spark is better at 1 benchmark (Humanity's Last Exam). GPT-5.4 significantly outperforms across most benchmarks.

Choose GPT-5.4 if…

  • you want the strongest raw capability — it leads on 7 of 8 shared benchmarks

Choose Muse Spark if…

  • you want the most recent training data — it shipped Apr 2026

Performance Benchmarks

Comparative analysis across standard metrics

8 benchmarks

GPT-5.4 outperforms in 7 benchmarks (ARC-AGI v2, GDPval-AA, GPQA, MMMU-Pro, SWE-Bench Pro, Tau2 Telecom, Terminal-Bench 2.0), while Muse Spark is better at 1 benchmark (Humanity's Last Exam).

GPT-5.4 significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.4 specifies input context (1,000,000 tokens). Only GPT-5.4 specifies output context (128,000 tokens).

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
Meta
Muse Spark
Input- tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and Muse Spark support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-5.4

Text
Images
Audio
Video

Muse Spark

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-5.4

Proprietary

Closed source

Muse Spark

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while Muse Spark was released on 2026-04-08.

Muse Spark is 1 month newer than GPT-5.4.

GPT-5.4

Mar 5, 2026

4 months ago

Muse Spark

Apr 8, 2026

3 months ago

1mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (1,000,000 tokens)
Higher ARC-AGI v2 score (73.3% vs 42.5%)
Higher GDPval-AA score (47.6% vs 38.8%)
Higher GPQA score (92.8% vs 89.5%)
Higher MMMU-Pro score (81.2% vs 80.4%)
Higher SWE-Bench Pro score (57.7% vs 52.4%)
Higher Tau2 Telecom score (98.9% vs 91.5%)
Higher Terminal-Bench 2.0 score (75.1% vs 59.0%)
Meta
Higher Humanity's Last Exam score (58.4% vs 39.8%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.4 and Muse Spark side-by-side, then vote on the output you prefer.

GPT-5.4
✓ Preferred
Muse Spark
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.4
Meta
Muse Spark

FAQ

Common questions about GPT-5.4 vs Muse Spark.

Which is better, GPT-5.4 or Muse Spark?

GPT-5.4 significantly outperforms across most benchmarks. GPT-5.4 is made by OpenAI and Muse Spark is made by Meta. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.4 compare to Muse Spark in benchmarks?

GPT-5.4 scores Tau2 Telecom: 98.9%, ARC-AGI: 93.7%, Graphwalks BFS <128k: 93.0%, GPQA: 92.8%, Graphwalks parents <128k: 89.8%. Muse Spark scores Tau2 Telecom: 91.5%, GPQA: 89.5%, CharXiv-R: 86.4%, ScreenSpot Pro: 84.1%, IPhO 2025: 82.6%.

What are the context window sizes for GPT-5.4 and Muse Spark?

GPT-5.4 supports 1.0M tokens and Muse Spark supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes GPT-5.4 and Muse Spark?

GPT-5.4 is developed by OpenAI and Muse Spark is developed by Meta.

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